نویسندگان
دانشکده مهندسی‌دریا، دانشگاه صنعتی امیرکبیر (پلی‌تکنیک تهران)
چکیده
هدف از ارائه این مقاله ارائه الگوریتم کاربردی جهت تحلیل ارتعاشات شفت - پروانه در شناورهای دریایی می باشد. در ابتدا شناور زیرسطحی در سرعت های مختلف در حالت ناپایا با استفاده از روش حجم محدود مورد تحلیل و بررسی قرار گرفته است. بر‌اساس نتایج به‌دست آمده از این تحلیل میدان دنباله پاشنه شناور و ورودی به پروانه در زمان های مختلف استخراج شده است. میدان جریان ورودی به پروانه در کد المان مرزی لحاظ شده است و با استفاده از این کد پروانه شناور در حالت ناپایا مورد تحلیل قرار گرفته است و نیروها و گشتاورهای اصلی و جانبی روی پروانه استخراج شده است. سپس داده های به‌دست آمده از روش المان مرزی به‌همراه هندسه دقیق شفت و پروانه با استفاده از روش المان محدود مورد بررسی قرار گرفته است. فرکانس طبیعی و اجباری پروانه در مودهای ارتعاشی مختلف تعیین شده اند. با توجه به داده‌های به‌دست آمده از آنالیز عددی المان محدود، بیشترین جابجایی پروانه مربوط به نوک پره در حالت ارتعاشات اجباری می باشد.
کلیدواژه‌ها
عنوان مقاله [English]
Free and Forced Vibrations of a Shaft and Propeller Using the Couple of Finite Volume Method, Boundary Element Method and Finite Element Method
نویسندگان [English]
- E. Yari
- H. Ghassemi
چکیده [English]
The main objective of this paper is to provide an applied algorithm for analyzing propeller-shaft vibrations in marine vessels. Firstly an underwater marine vehicle has been analyzed at different speed in unsteady condition using the finite volume method. Based on the results of this analysis, flow field of marine vehicle (wake of stern) and velocity inlet to the marine propeller is extracted at different times. Propeller inlet flow field is applied in the boundary element code and using this code, marine propeller has been analyzed in unsteady state. In continue, main / lateral forces and moments over the propeller are extracted. Then the data obtained from the boundary element code alongwith exact geometry of the propeller and shaft have been studied, using finite element code. Natural and forced frequency of the propeller have been determined in various modes of vibration. According to obtained data from Finite Element Method (FEM) numerical analysis, maximum displacement of propeller is for displacement of the propeller tip in forced vibration state
کلیدواژه‌ها [English]
- Propeller vibration
- shaft
- Boundary Element Method (BEM)
- Finite Element Method (FEM)
- Finite Volume Method (FVM)
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